US3839149A - Headbox for cylinder papermaking machine having flexible trailing elements therein and a flexible slice roof of tapering thickness - Google Patents

Headbox for cylinder papermaking machine having flexible trailing elements therein and a flexible slice roof of tapering thickness Download PDF

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Publication number
US3839149A
US3839149A US00172822A US17282271A US3839149A US 3839149 A US3839149 A US 3839149A US 00172822 A US00172822 A US 00172822A US 17282271 A US17282271 A US 17282271A US 3839149 A US3839149 A US 3839149A
Authority
US
United States
Prior art keywords
roll
forming
roof
stock
roof member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00172822A
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English (en)
Inventor
E Justus
A Roerig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beloit Corp
Original Assignee
Beloit Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Priority to US00172822A priority Critical patent/US3839149A/en
Priority to CA147,939A priority patent/CA964089A/en
Priority to GB3518772A priority patent/GB1394167A/en
Priority to ES405634A priority patent/ES405634A1/es
Priority to IT28088/72A priority patent/IT963930B/it
Priority to JP47081521A priority patent/JPS4828702A/ja
Priority to DE2240596A priority patent/DE2240596A1/de
Application granted granted Critical
Publication of US3839149A publication Critical patent/US3839149A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/04—Complete machines for making continuous webs of paper of the cylinder type

Definitions

  • the invention relates to improvements in forming machines of the type wherein fiber carrying stock is fed onto the surface of a porous rotating roll and the stock is dewatered through the roll to form a web on its surface.
  • the instant invention relates to improvements in web formers of this type known as hydraulic formers wherein the stock is fed onto the surface of the roll at a pressure to increase the rate of dewatering and improvements are provided for a more rapid, more satisfactory forming process wherein a variety of types of stocks having different fibers and different consistencies can be satisfactorily handled.
  • a still further object of the invention is to provide an improved hydraulic headbox which enables the formation of a better web and provides factors of adjustment which enables uniform random orientation and dispersement of the fibers.
  • a further factor to be taken into consideration in the formation of a web in a hydraulic headbox is the condition of the stock as it arrives at the forming roll. Random nonuniform dispersion of fibers, orientation of fibers either in a cross-machine or in a machine direction, and flocculation of the fibers all contribute to making a web of reduced quality. It has been difficult from machines heretofore available to maintain uniform dispersion of fibers in the stock in the relatively slower flow rates which occur in a cylinder forming machine of the type above described wherein the web is formed on a porous roll.
  • a feature of the present invention is the provision of stock to the slice on a cylinder forming machine with the fibers uniformly dispersed and to provide a pressure forming zone wherein the roof is flexible and adjustable from its leading edge to its trailing edge so that the slice opening and the distance of the roof at its trailing edge can be independently adjusted and the curvature of the forming zone can be independently adjusted so that the forming zone can be adjusted in accordance with the drainage rate profile for optimum formation of the web.
  • a still further object of the invention is to provide an improved hydraulic cylinder forming machine which has improved features of construction and is more compact than structures heretofore available.
  • FIGURE is a side elevational view shown partially in section of the forming section of a hydraulic former constructed and operating in accordance with the principles of the present invention.
  • the cylinder forming machine includes a porous rotatable forming cylinder 10. This is a perforate shell and the water from the stock supplied to a forming zone 25 on the uprunning side passes into the center of the cylindrical roll and is removed.
  • the shell of the forming cylinder 10 also may be provided as an open suction roll with a suction gland extending throughout the forming zone 25 up to the felt I].
  • the web formed on the uprunning side of the cylinder 10 is couched off onto a felt 11, and the felt may carry one or more additional layers of web formed by other formers along the line of the machine.
  • the stock is supplied to the cylinder 10 by a pressure headbox 13.
  • the stock is received from a stock supply including a fan pump to a header chamber 14 of the headbox.
  • the stock flows through a plurality of parallel cylindrical headbox tubes 15.
  • the fibers of the stock are well dispersed and stock is in turbulence with the turbulence being reduced from larger scale turbulence to smaller scale turbulence through the tubes 15 retaining the fibers in random orientation.
  • the stock flows into a slice chamber 130 which is tapered and is formed by a lower slice wall 18 and an upper slice wall 20, with the upper slice wall facing toward the cylinder 10.
  • the slice chamber is provided with flexible elements 16 which further reduces the scale of turbulence.
  • the stock emerges into the forming zones 25 through a slice opening 13b.
  • At the lower portion of the slice opening is an apron 19 which is rigidly secured to the trailing edge of the stationary lower slice wall 18, and the stock is fed onto the surface of the cylinder at the trailing edge of the apron 19.
  • the upper slice wall is preferably pivotally mounted and is movable to change the size of the slice opening 13b.
  • a preferred form of hinge is shown at 21 formed of relatively stiff plastic which rigidly supports the loca tion of the upstream edge 20b of the upper slice wall 20 and permits the downstream edge 20c to pivotally move relative to the apron 19.
  • the hinge 21 may be formed of reinforced plastic such as fiberglas. As illustrated in the drawing, the plastic hinge 21 is suitably bolted to the headbox and to the slice wall 20 to provide a smooth flow surface which will not catch and retain fibers of the stock and which accommodates a smooth flow pattern for the stock.
  • the trailing members 16 are flexible, and are preferably in continuous sheet form extending continuous in a crossmachine direction. In an alternative form, the flexible trailing members 16 may be in the form of numerous divided filaments. It has generally been discovered that ordinary separations or divisions in the sheets 16 which provide communication between the chambers between the sheets will cause flow ridges or flow streams that continue on through the forming zone so as to cause ridges in the formed web.
  • the separate flow streams of stock will retain their fine scale turbulence and the fibers will not orient in a cross-machine direction or in a machine direction as they flow through the tapered slice chamber 13a. It has also been discovered that the number of flexible trailing sheets 16 should preferably be limited in number.
  • the taper of the elongate slice chamber 13a should be no less than 3.
  • the forming zone is formed between the surface of the cylinder 10 and a slice roof 22.
  • the roof 22 is formed of a flexible material such as fiberglas or reinforced plastic which has sufficient rigidity to retain its shape under the pressures experienced from the stock in the forming chamber 25, but which will change shape from forces applied such as to the upstream edge 22a and downstream edge 22b of the roof 22.
  • This roof of fiberglas or reinforced plastic is less expensive to manufacture and easier to form into the specific shape required.
  • the roof is mounted at its upstream edge 22a on the downstream edge of the slice roof 20.
  • the entire roof is supported on a cross-machine beam 26.
  • the beam is mechanically positioned by a hydraulic or mechanical actuator 27 which is shown schematically.
  • the position of this beam 26 determines the overall position of the roof 22 relative to the surface of the cylinder 10, and also the overall position of the downstream edge of the upper slice wall 20. Movement of the beam will change the space 13b and thus the flow of stock without changing the curvature of the roof 22.
  • Additional adjustment means are provided for adjusting the position of the upstream edge 22a and the downstream edge 22b of the roof. These are in the form of force applying members, including a jack 23 which is connected between the beam 26 and the upstream edge 22a of the roof 22. A jack 24 is connected between the beam 26 and the downstream edge 22b of the roof.
  • Adjustment of the upstream jack 23 will change the slice opening and the rate at which the stock is fed into the forming zone 25. Adjustment of the downstream jack 24 will change the spacing between the downstream edge 22b of the roof relative to the cylinder 10.
  • the upstream edge 22a and the downstream edge 22b of the roof 22 are supported so that the roof bends as the edges are moved.
  • the upstream edge 22a is in effect cantilever supported so that bending will occur along the length of the roof 22.
  • the downstream end 22b of the roof is rigidly held so that the roof bends along its length as the other edge 22a is moved toward or away from the roll.
  • the roof 22 is also designed to vary in strength along its length so that for range of positions of the upstream edge 22a, and the range of positions of the downstream edge 22b, the roof will be bent to maintain an optimum shape and taper of the forming zone 25.
  • the design of the roof strength requires a taper in a downstream direction.
  • the roof will be designed in strength to change curvature as the upstream of trailing edges of the roof are moved and to maintain a forming zone of optimum shape. That is, the drainage rate profile along the forming zone will change and remain optimum along the length of the roof with change in slice opening leading to the forming zone or with change in the position of the trailing edge of the roof.
  • a rotatable porous forming roll for draining water from a slurry of stock deposited on the surface thereof and forming a web
  • a headbox for receiving stock under pressure extending along the roll and having a lower wall and an upper wall facing the roll and having a slice opening
  • a curved roof member nonrigid in the direction of curvature mounted on the upper wall extending from the slice opening along the surface of the forming roll, and
  • first and second power means at the leading and trailing edges of said roof member moving away from the roll along paths which extend in a converging angle toward each other so that said roof member bends and changes curvature about its length as it is moved toward or away from the roll.
  • a rotatable porous forming roll for draining water from a slurry of stock deposited on the surface thereof and forming a web
  • a headbox for receiving stock under pressure extending along the roll with a lower wall and an opposing upper wall facing the roll and having a slice opening at the downstream edges with the downstream edges extending substantially the same distance in the direction of the flow stream,
  • a curved roof member tapered in a downstream direction extending from the slice opening along the surface of the forming roll and pivotally attached to the downstream edge of the upper wall, the roof member having a predetermined curvature for optimum flow characteristics between the roof and forming roll,
  • a cantilever support for one end of the roof member, and an adjustment means connected to the other end of the roof member for moving it toward or away from the roll to bend it about the cantilever support so that its curvature changes in different amounts along its length.
  • said adjustment means and cantilever support include first force means for moving the upstream edge of said roof member toward or away from the roll, a second force means for moving the downstream edge of said roof member toward or away from the roll, and a third force member connected to both of said first and second force means for moving the entire roof member relative to the forming roll.
  • said adjustment means and cantilever support include a first support at the upstream edge of said roof, a second support at the downstream edge of said roof, and each support being rigidly connected to the roof so that as either support is moved in a direction toward or away from the roll the roof will bend about the other support, and first and second power means respectively connected to said supports for moving said supports in a direction toward or away from said forming roll.
  • the combination constructed in accordance with claim 2 including a plurality of trailing flexible members extending in a cross-machine direction parallel to the roll within said headbox anchored at their upstream ends with their downstream edge selfpositioned by forces of the stock flowing through the headbox.
  • the combination including a plurality of elongate passages extending parallel to the flow of stock through the headbox positioned upstream of said flexible members.

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US00172822A 1971-08-18 1971-08-18 Headbox for cylinder papermaking machine having flexible trailing elements therein and a flexible slice roof of tapering thickness Expired - Lifetime US3839149A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00172822A US3839149A (en) 1971-08-18 1971-08-18 Headbox for cylinder papermaking machine having flexible trailing elements therein and a flexible slice roof of tapering thickness
CA147,939A CA964089A (en) 1971-08-18 1972-07-24 Hydraulic former
GB3518772A GB1394167A (en) 1971-08-18 1972-07-27 Hydraulic former
ES405634A ES405634A1 (es) 1971-08-18 1972-08-08 Perfeccionamientos introducidos en una maquina para formar papel continuo de una pasta que contiene fibras.
IT28088/72A IT963930B (it) 1971-08-18 1972-08-11 Macchina per formare un nastro di materiale fibroso
JP47081521A JPS4828702A (ja) 1971-08-18 1972-08-16
DE2240596A DE2240596A1 (de) 1971-08-18 1972-08-18 Walzen-formvorrichtung zur herstellung von faserbahnen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00172822A US3839149A (en) 1971-08-18 1971-08-18 Headbox for cylinder papermaking machine having flexible trailing elements therein and a flexible slice roof of tapering thickness

Publications (1)

Publication Number Publication Date
US3839149A true US3839149A (en) 1974-10-01

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ID=22629379

Family Applications (1)

Application Number Title Priority Date Filing Date
US00172822A Expired - Lifetime US3839149A (en) 1971-08-18 1971-08-18 Headbox for cylinder papermaking machine having flexible trailing elements therein and a flexible slice roof of tapering thickness

Country Status (7)

Country Link
US (1) US3839149A (ja)
JP (1) JPS4828702A (ja)
CA (1) CA964089A (ja)
DE (1) DE2240596A1 (ja)
ES (1) ES405634A1 (ja)
GB (1) GB1394167A (ja)
IT (1) IT963930B (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943035A (en) * 1973-04-17 1976-03-09 Sulzer Brothers Limited Breast box having an adjustable lip in a paper making machine
US4050499A (en) * 1974-07-08 1977-09-27 Boxboard Research And Development Association Head box for cylinder molds having a flexible lid element
US4141789A (en) * 1977-11-22 1979-02-27 Beloit Corporation Headbox having pivoted bridging cover
US4675078A (en) * 1981-11-10 1987-06-23 Molnlycke Aktiebolag Web forming method and device
US4812208A (en) * 1985-07-30 1989-03-14 Seishi Gijutsu Kenkyu Kumiai Headbox for paper machine with parallel twisted plates
US5160583A (en) * 1991-12-02 1992-11-03 Beloit Corporation Controlled jet injection apparatus for a papermaking machine headbox
US5298127A (en) * 1992-10-23 1994-03-29 Westvaco Corporation Paper machine deckle support and flushing means
WO1999066123A1 (en) * 1998-06-19 1999-12-23 Kimberly-Clark Worldwide, Inc. Suction breast roll former

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930592A1 (de) * 1999-07-02 2001-01-11 Voith Paper Patent Gmbh Stoffauflauf

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418600A (en) * 1944-02-01 1947-04-08 Scott Paper Co Method and machine for forming paper
US2717539A (en) * 1952-03-21 1955-09-13 Walter W Metcalf Papermaking machine
US3072180A (en) * 1959-09-03 1963-01-08 Rice Barton Corp Flexible flow stabilizer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418600A (en) * 1944-02-01 1947-04-08 Scott Paper Co Method and machine for forming paper
US2717539A (en) * 1952-03-21 1955-09-13 Walter W Metcalf Papermaking machine
US3072180A (en) * 1959-09-03 1963-01-08 Rice Barton Corp Flexible flow stabilizer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943035A (en) * 1973-04-17 1976-03-09 Sulzer Brothers Limited Breast box having an adjustable lip in a paper making machine
US4050499A (en) * 1974-07-08 1977-09-27 Boxboard Research And Development Association Head box for cylinder molds having a flexible lid element
US4141789A (en) * 1977-11-22 1979-02-27 Beloit Corporation Headbox having pivoted bridging cover
US4675078A (en) * 1981-11-10 1987-06-23 Molnlycke Aktiebolag Web forming method and device
US4812208A (en) * 1985-07-30 1989-03-14 Seishi Gijutsu Kenkyu Kumiai Headbox for paper machine with parallel twisted plates
US5160583A (en) * 1991-12-02 1992-11-03 Beloit Corporation Controlled jet injection apparatus for a papermaking machine headbox
US5298127A (en) * 1992-10-23 1994-03-29 Westvaco Corporation Paper machine deckle support and flushing means
WO1999066123A1 (en) * 1998-06-19 1999-12-23 Kimberly-Clark Worldwide, Inc. Suction breast roll former
US6146500A (en) * 1998-06-19 2000-11-14 Kimberly-Clark Worldwide, Inc. Suction breast roll former and method, with flexible headbox roof

Also Published As

Publication number Publication date
DE2240596A1 (de) 1973-03-01
CA964089A (en) 1975-03-11
ES405634A1 (es) 1975-07-16
JPS4828702A (ja) 1973-04-16
GB1394167A (en) 1975-05-14
IT963930B (it) 1974-01-21

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